A new idea that adopts a geotextile instead of a latex membrane to improve the performance of compaction-grouted soil nail

was proposed. Based on the self-developed device for testing geotextile’s filtration performance

a series of cement slurry filtration tests was carried out to study the influence of water-cement ratio

slurry volume and grouting pressure on the geotextile’s filtration performance. In addition

strength tests were carried out on cement blocks obtained from the slurry before and after filtration test. The main conclusions drawn are as follows. As the water-cement ratio increases

the final filtration mass of the slurry

the end time of the filtration and the mass flow rate increase accordingly

but the increment of the end time of filtration gradually decreases; the change in the volume of the slurry does not affect the mass flow rate. However

the end time of filtration linearly increases with the volume of the slurry. With the increase of the grouting pressure

the mass flow rate of the slurry gradually increases. At the same time

the increase rate of the expansion area of the geotextile is linearly increased with the grouting pressure. By adopting the geotextile

the water-cement ratio in the grout bulb is significantly reduced

which then largely improves the strength. This study is helpful for the application of the compaction-grouted soil nail by using geotextile.